AEP Mechanical and Power System

H. Heetderks

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

2

AEP Mechanical Design

• System Consists of Six Circuit Boards, each Surrounded by an Aluminum Frame– Low Voltage Power Converter is on top to conduct heat to thermal radiator

– Power Controller, Data Processing Unit, Instrument Data Controller, Mass Memory, and Data Compression Module follow in order

– Base Plate mounts unit to spacecraft deck

• Electrical Connections made with Stacking Connector on each Board– Avoids need for Mother Board

• Thermal Radiator attaches to feet on top of assembly

• Walls of Frames are .200 inches thick to provide radiation shielding and a heat path to the thermal radiator

• The Stack is held together with 10 Skewer Rods

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

3

AEP Mechanical Assembly

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

4

Exploded View of AEP Assembly

Bottom Plate

DCM

Mass Memory

Instr Data Controller

DPU

Power Controller

LVPS

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

5

AEP Mechanical Fabrication Status

• Mechanical Part Drawings are Complete and in Configuration Control

• Assembly Drawings are nearly complete

• All Machined Parts for both ETU and Flight Unit including Frames and Top and Bottom Plates are complete

• Parts have been fit tested and put in Flight Stores

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

6

Power System Requirements

• System provides 21 switched and current limited services, each with a voltage and current monitor

• Power on reset circuit detects brown out on primary side

• Filtering and shielding at outputs to reduce converter noise seen by instrument

• Filtering on inputs to protect system against CS-06 EMC test

• Fully redundant DC-DC converters

• Includes Analog Multiplexor and ADC to digitize 128 channels including power system voltages and currents

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

7

Power System Requirements, Switched Outputs

Current Fold FET Load TotalLimit Back Max Max By Conv

Service Function Voltage Value Ratio Power Power Conv MaxNumber (mA) (Watts) (Watts) (mA) (mA)

1 MM + 5 2000 0.2 3.00 10.002 DCM + 5 2000 0.2 3.00 10.003 AP + 5 200 1.0 0.50 1.004 TEC + 5 1500 0.2 2.25 7.505 FEC + 5 500 0.6 1.00 2.506 SP + 5 1000 0.4 1.75 5.007 Spare + 5 1500 0.2 2.25 7.50 8700 60008 SI Body Htr + 12 600 0.2 2.16 7.209 Day Sens + 12 100 1.0 0.60 1.2010 SI HVPS + 12 300 0.5 1.35 3.6011 SP HVPS1 + 12 300 0.5 1.35 3.6012 SP HVPS2 12 300 0.5 1.35 3.6013 FEC + 12 200 1.0 1.20 2.4014 SP + 12 100 1.0 0.60 1.2015 SI Lens Htr 12 600 0.4 2.52 7.2016 Stepper + 12 800 0.2 2.88 9.60 3300 250017 FEC - 12 200 1.0 1.20 2.4018 SP - 12 100 1.0 0.60 1.2019 SP Flt Htr - 12 600 0.2 2.16 7.2020 Stepper - 12 800 0.2 2.88 9.6021 SI Flt Htr - 12 600 0.2 2.16 7.20 2300 2500

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

8

Analog Multiplexer and ADC Inputs (1)

Input InputNumber Function Number Function

0 Mass Mem +5 Current 32 SP 1 HV Current1 Mass Mem +5 Voltage 33 SP 1 HV Voltage2 DSP +5 Current 34 SP 2 HV Current3 DSP +5 Voltage 35 SP 2 HV Voltage4 Array Photometer +5 Current 36 SP 3 HV Current5 Array Photometer +5 Voltage 37 SP 3 HV Voltage6 Imager TEC +5 Current 38 SP 4 HV Current7 Imager TEC +5 Voltage 39 SP 4 HV Voltage8 Camera Interface +5 Current 40 SP 5 HV Current9 Camera Interface +5 Voltage 41 SP 5 HV Voltage10 Spectrophotometer +5 Current 42 SP 6 HV Current11 Spectrophotometer +5 Voltage 43 SP 6 HV Voltage12 SP Body Heater +5V Current 44 Imager MCP HV Current13 SP Body Heater +5V Voltage 45 Imager MCP HV Voltage14 Imager Body Heater +12 Current 46 Spare 015 Imager Body Heater +12 Voltage 47 Spare 116 Day Sensor +12 Current 48 FEC Temperature 17 Day Sensor +12 Voltage 49 CCD Temperature 18 Imager HVPS's +12 Current 50 TEC Heat Sink Temperature 19 Imager HVPS's +12 Voltage 51 Imager Lens Temperature 20 Spectrophotometer HVPS 1 +12 Current 52 Day Sensor Temperature 21 Spectrophotometer HVPS 1+12 Voltage 53 Imager Filter Wheel Temperature 22 Spectrophotometer HVPS 2+12 Current 54 Stepper Motor Temperature 23 Spectrophotometer HVPS 2+12 Voltage 55 Imager Intensifier HVPS Temperature 24 Camera Interface +12 Current 56 Imager Phosphor HVPS Temperature 25 Camera Interface +12 Voltage 57 Spectrophotometer Analog Board Temp26 Spectrophotometer +12 Current 58 Spectrophotometer HVPS 1 Temperature 27 Spectrophotometer +12 Voltage 59 Spectrophotometer HVPS 2 Temperature 28 Imager Lens Heater +12 Current 60 Spectrophotometer Filter 1 Temperature 29 Imager Lens Heater +12 Voltage 61 Spectrophotometer Filter 2 Temperature 30 Imager Stepper Motor +12 Current 62 Spectrophotometer Filter 3 Temperature 31 Imager Stepper Motor +12 Voltage 63 Spectrophotometer Filter 4 Temperature

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

9

Analog Multiplexer and ADC Inputs (2)

Input InputNumber Function Number Function

64 Spectrophotometer Filter 5 Temperature 96 FEC065 Spectrophotometer Filter 6 Temperature 97 FEC166 Spectrophotometer Body Temperature Right 98 FEC267 Spectrophotometer Body Temperature Left 99 FEC368 Spare 2 100 FEC469 Spare 3 101 FEC570 Power Controller Board Temperature 1 102 FEC671 Power Controller Board Temperature 2 103 FEC772 DPU Board Temperature 104 FEC873 Mass Memory Board Temperature 105 FEC974 DCM Board Temperature 106 FEC1075 Sensor Int'f Board Temperature 107 FEC1176 LVPS Temperature 1 108 FEC1277 LVPS Temperature 2 109 FEC1378 PWR_MON_PR 110 FEC1479 PWR_MON_BU 111 FEC1580 Camera Interface -12 Current 112 AP0 Array Photometer +12Current81 Camera Interface -12 Voltage 113 AP1 Array Photometer +12 Voltage 82 Spectrophotometer -12 Current 114 AP283 Spectrophotometer -12 Voltage 115 AP384 Spectrophotometer Filter Heaters -12 Current 116 AP485 Spectrophotometer Filter Heaters -12 Voltage 117 AP586 Imager Stepper Motor -12 Current 118 AP687 Imager Stepper Motor -12 Voltage 119 AP788 DPU +5 Current 120 AP889 DPU +5 Voltage 121 AP990 DPU +12 Current 122 AP1091 DPU +12 Voltage 123 AP1192 DPU -12 Current 124 AP12 Array Photometer -12 Current93 DPU -12 Voltage 125 AP13 Array Photometer -12 Voltage 94 Imager Filter Heater -12 Current 126 AP1495 Imager Filter Heater -12 Voltage 127 AP15

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

10

Power System Block Diagram

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

11

Schematic of Low Voltage Converter Board

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

12

Schematic of Power Controller Board

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

13

Schematic of Limiter, Monitor, Switch Circuit

CDR July, 2001NCKU UCB Tohoku AEP Mechanical and Power System H. Heetderks

14

Power System Development Status

• ETU Power System Fabrication and Debug is nearly complete

• Flight Unit Mechanical Parts Complete and in Stores

• All EEE Parts in House for Flight Unit Fabrication

• Flight Printed Circuit Boards will be Etched following ETU System Test